Posts by Robson Bilibio

Hello again,

Thanks guys, the information you provided is very useful for me and colleagues. We were testing many hypothesis, but knowing that this is not an isolated case settles down everything.

I'm frustrated that I can't thank you all personally, but in case of anyone come to Brazil I'll be happy to pay a beer.

dblbeard, If you think they consider you dumb, I'm unable to imagine what they think of us Brazilians, eheheehhe. thank you very much, your information is enlightening about this problem.

I work with robots for just over two years.

In this case:

We took an thermal image of the motors, the highest temperature we found was 57.8°C, in some manual I found the information that the limit in the motor frame is 100°C, this information is for the MU100 to MU400 external axis motors, but in the lack of information about the manipulator I considered this number.

The oil analysis from ABB came to nothing, everything was ok.

In simulation of the work cycle with RobotStudio and Gearbox Heat Prediction tool, the result is ok for every robot/axis.

The seals, motors and robots were originals.

The preventive maintenance (oil change) was executed by ABB itself.

The conclusion is that there is some problem with the equipment. I'm sad that ABB isn't helping us with this.

Once again, thank you all.

Thanks Skooter, we called a company that inspects and analyses the oil, they will come next week.

Does anyone know the normal operating temperature of the servomotors? We measured in one robot 57,8°C in the axis 2 motor, is it normal? I was unable to find any information about the operating temperature of the motors in the manuals.

Thank you

Sure, the robots are IRC5, they were installed in 2014 (this was the SOP of the production line, not the manufacturing date of the robots).

Hello,

The motors are Tamagawa (TAMAGAWA SEIKI CO.,LTD.).

I'm not sure what you means by "controller version"

Hello,

We have about 38 robot in our factory, recently (1 year ago), some robots started to present a problem, the oil from the gear box leak and contaminate the motor brake, the axis slips and generate an insecure condition to our process.

Most of the models (6 in total) are IRB7600-340/2.8 except one that is a 6640-185/2.8. The axis 2 and 3 had this problems (not in the same robot, some in the axis 2, some in the axis 3).

The robots have about 15000 hours of operation, and had the first oil change with 6000 hours by ABB.

We don't have a heavy duty process, I simulated the routine with Gearbox Heat Prediction in RobotStudio (thanks ABB to release the trial version this year) and none of them presented any consideration to install a fan. We measured the axis temperature during the normal process and the hottest temperature we found was about 50ºC (I do not think it's too much).

My question is, does anyone else have this problem? Did you found any reason for this to happen? If not, any tip will be very appreciated.

Thank you very much.

Hello Gildur,

Thanks for your help!

I found other information about this.

The manufacturer of the gear reducer of the ABB robots is NABTESCO, the information can be found in the internet, for my robots it's the RV Series, there is no standard reducer with this ratio, I think the ABB reducers are special order.

You can get the ration also in the code of ABB, if you search for 3HAC17811-1 (replacement reducer for axis 6) the code is RV 125F-178,41, it isn't in the catalog of the NABTESCO, the RV is the series, 125 is related to the torque and frame, 178,41 is the ratio, and "F" is a special series of RV with IP67.

But it's much easier with your method.

Thank you again,

Hello,

I'm trying to use laser to fine calibrate after a motor change of my robots, I want to test this method, but I was unable to calculate the error in the calibration.

I had a difference of 0,005 rad in the motor calibration offset, but I would like to know how much this represents in the joint, does anyone know how to get this information (Gear Ratio)?

Robot: ABB IRC5 IRB 7600-500/2.55.

Thanks